Anchoring structure for building slabs



Aug. 10, 1965 M. LONG 3,199,259

ANCHORING STRUCTURE FOR BUILDING SLABS Filed Dec. 15, 1961 5 Sheets-Sheet l I a MM? I Illll INVENTOR MARSHALL LONG BY 51% M ATTORNEYS Aug. 10, 1965 M. LONG 3,199,259

ANCHORING STRUCTURE FOR BUILDING SLABS Filed Dec. 15, 1961 3 Sheets-Sheet 2 INVENTOR MARSHAL 1. LONG BY 5.6% M

ATTORNEYS Aug. 10, 1965 M. LONG 3,199,259

7 ANCHORING STRUCTURE FOR BUILDING SLABS Filed Dec. 15, 1961 3 Sheets-Sheet 3 INVENTOR MA RSHALL L ONG BY EM 049% ATTORNEYS United States Patent 3,199,259 ANQH'GRIIJG STRUQTIURE FOR BUILDWG SLABS Marshall Long, 19981 Mission Road, (fiverland Park, Kass.

Filed Dec. 15, 1961, Ser. No. 159,624 6 Claims. (Cl. 52283) This invention relates to a means for supporting horizontal concrete slabs from vertical columns. More specifically, it is designed for use in supporting slabs which are poured at one level and elevated to positions where they serve as the roof or upper floors of a building.

It is well known in the prior art to pour concrete slabs about a number of vertical columns and then raise said slabs by power units mounted atop each column. In order to maintain a proper distribution of slab stresses around each column metallic collars free to slide along each column are customarily located in the slab. Generally the hoisting power units have rods which engage fittings in the collars, whereby the collars and the en casing slabs are hoisted.

There have heretofore been proposed designs for the construction of these collars and many means to aflix the collars to the column when raised into the desired position. It is an object of this invention to provide an improved collar and collar securing means for such an installation.

Some of the prior designs require welding the collars in place after the slab is in position. This involves the use of scaifolding and results in timely delays between the raising of subsequent slabs. Furthermore, the vertical positioning of the various collars is diflicult to adjust.

Other supporting means have been devised wherein the welding of abutments to the columns was done before lifting, but generally the designs of this type require unsightly projections to extend below the slab. Furthermore, the aperture in the collar must be large enough to pass over the abutments and is therefore not in snug sliding engagement with the column itself.

It is an object of this invention to provide a collar and a support therefor which will overcome the disadvantages of the prior art and which will present new and desirable advantages.

The collar and supporting means of the present invention is of simple construction and hence may be manufactured inexpensively.

It is of such design that no projections extend outside the concrete slab, hence a fireproof fit is established and the installation presents a more refined appearance.

In buildings erected by this method, an extremely important consideration is the vertical adjustment of the slab by adjusting the height of the individual collars which are unitary with the slab. Vithout precise alignment of all collars, unnecessary stresses will exist in the slabs and may eventually lead to the failure of the structure. I

Vertical adjustments of the collars and the surrounding slab portion may easily be made by using the unique wedging method disclosed herein. These adjustments may be made from atop the raised slab, thus eliminating the hazards and expense involved in working immediately beneath the column-collar juncture.

Furthermore, the design of my collar and collar support renders it possible to make considerable vertical adjustments in collar height without resorting to wedges of various sizes, shims, or other devices.

For a more complete understanding of the nature and scope of the invention reference is had to the drawings in which FIGURE 1 is a perspective view of the collar member;

FIGURE 2 is a perspective View of the anchor member used in buildings of concrete or masonry column con struction;

FIGURE 3 is a sectional view of the collar taken along the line 3-3 shown in FIGURE 1;

FIGURE 4 is a perspective view of a typical wedge used with the invention;

FIGURE 5 is a sectional view of the complete installation as installed on an enlarged scale;

FIGURE 6 is a sectional view taken along the line 6-43 in FIGURE 5;

FIGURE 7 illustrates a typical installation of anchoring means on a conventional beam column;

FEGURE 8 is a plan view of a collar and wedges in position on the anchoring means of FIGURE 7; and

FIGURE 9 is a sectional view taken along line 99 in FIGURE 8.

A collar embodying my invention is indicated at 10 and is shown in the preferred form, which is readily adaptable for use with concrete, masonry and steel girder columns. The collar comprises a plate section 12 with a quadrangular aperture therethrough surrounded by flanges l4 and 16. The opposed flanges 14 are perpendicular to plate 12; whereas the flanges 16 are inclined inwardly toward the aperture. Disposed outside the flanges 16 and integral therewith are raised hollow portions 18 with keyholes 2e located in the top portions 18a thereof, said l eyholes being designed to accommodate the lift rods and their heads which depend from the slab hoisting equipment. The aperture formed by the top edges of the flanges 14 and 16 is in close sliding engagement with a building column 32. The inside faces of flanges 14 are likewise in close engagement with the column 32.

Located in the column 32 at a height where the slab is to be finally supported is a collar support member 21 comprising two parallel and spaced apart shear blocks 22 of trapezoidal shape with a spacing bar 24 located therebetween. Other such collar support members 21 are built into the column in proper spaced relation for other slab securement.

As shown in FIGURE 2, a concrete or masonry column 32 is recessed along two opposing faces to accommodate the shear blocks 22. The longer parallel edge 22a of each shear block is equal to the width of the column measured across the recessed face.

The spacing bar 2 4, which may assume any form but here shown T-shaped in cross section, is of such length that the outer faces 2219-225) of the shear blocks 22 are located substantially flush with the rest of the nonrecessed face of the column.

Wedges 2.6 serve to lock the collar ill and the collar support 21 together and provide a means for making vertical adjustments of the elevated slab. It is to be noted that these are easily inserted and adjustably set from a position above the slab 28 which readily forms a working platform.

Referring to FIG. 5, it will be noted that in a given vertical plane, the inclined surface of the collar flange 16 is inclined to a vertical axis to a lesser angle than is the side 22c on the column shear block. In this vertical plane, the wedge 26 has its opposite non-parallel sides engaging the inclined surfaces on the collar and column, and its enlarged end is elevated above its reduced end. The wedge is movable along an inclined axis in this vertical plane to adjust the position of the collar on the column.

The collar, wedge, and collar support will normally be used in the following described manner:

When slabs for the upper floors and roof of a building are first poured, the building will consist of a foundation, lower floor, and a number of vertical columns which will eventually support the elevated horizontal slabs. vertical columns will have the collar supports 21 installed therein at height where the upper slabs will be mounted. Before each upper slab is poured, the collars which will support it will be placed about each of the supporting columns. The concrete is poured over the collars and into appropriate forms. Above the lift keyholes access passage are left in the slab through which the lift rods may pass when the slab is raised.

When each slab is lifted to its designed height, the

wedges are inserted from above the slab between the collar and collar support as shown in FIGURES 5, 6 and 9. Vertical adjustments may be made by loosening the wedges or driving them in further, as required. An important concept in my invention is that sizable adjustments may be made in slab height with relatively little motion of the wedge. This is achieved by my design which creates a large vertical collar motion from a' small horizontal displacement. The small horizontal displacement is that imposed by moving the wedge, thus changing the distance between the flanges 16 and the shear blocks 22. As seen in FIG. 5, the enlarged end of the wedge 26 is oriented toward the uppermost end of the inclined side 220 of the shear block 21.

In the particular collar shown, the flanges 16 are inclined ten degrees from the vertical; the sides of the shear block 22c are inclined thirty degrees and the non-parallel edges of wedge 26 form a twenty degree angle. Using these angles the slab may be raised or lowered two inches by moving the wedge 26 only three inches. If major adjustments are required, they may be made using shims or a wedge of larger size.

This arrangement for adjustment in no way disables the collar and its supports from fully supporting its designed weight.

Due to the design of the present invention it will be noted that when the lift rods are disengaged from the collar support, the weight of the slab will exert a compressive force upon each wedge 26, which transfers the force to the shear block 22. This compressive force, in itself, is suflicient to hold each wedge in place, making it unnecessary to weld the assembly together, If desired,

however, the wedge may be pot welded when in its proper position.

The entire slab support assembly, including collar, wedge, and collar support may then be covered by filling the spaces around the column with concrete, plaster, or any other suitable materials, thus providing asafe, neat, simple, and fireproof fitting between slab and column.

The present invention may be used-with equal facility on buildings having vertical wide flange columns such as the steel I beam shown in FIGURES 7, 8, and 9. When columns of this type are used in buildings, the collar support 21 used with concrete beams, is replaced by metal pieces which form shear blocks 22', and which assume the same shape a the shear blocks 22 of the collar support 21. FIGURE 7 shows a typical installation of the shear blocks 22 wherein each of the trapezoidal pieces is installed on the inner side of the flanges 36 in two segments, one on either side of the web 38 of the I beam. In the illustrations, the shear blocks 22' are welded to The tially equal to the angle formed by the inclined flange 16 of the collar and the side of the shear block 22 or 22a. This ensures a proper fit and provides the positive locking action demanded of a building component of this nature.

It is now clear that the above-described invention answers the need for 'aninexpensive, slab encased, easily installed slab support for buildings constructed by the lift slab method.

The foregoing detailed description is given for clearness of understanding only and no unnecessary limitations are to be understood therefrom, as some modifications will be obvious to those skilled in the art.

I claim:

ll. In a building structure, the combination comprising a vertical support column having at least one trapezoidal shear block mounted thereon in a vertical plane in a manner whereby the longer parallel side of said shear block is the lowermost horizontal edge; a slab; a collar within said slab, said collar comprising a horizontal plate With an aperture therein, said aperture surrounded by at least two flanges with portions inclining inwardly and upwardly and facing the non-parallel sides of said shear block, said inclined portions of said flange having a lesser inclination tov a vertical axis than do the non-parallel sides the beam at 40, but any known means may be used for this purpose.

The collar 10 is identical to that used for the concrete column. All lifting and adjusting procedures are the same as that described previously. Suitable means may be employed to prevent inadvertentloss of the wedge through the column while making adjustments.

The shear blocks may be mounted on the inner flange of a beam as shown in figures, or they may be welded to the outer beam surfaces. Likewise, shear block may be mountedon beams of other configurations than that of the I beam illustrated. a g v V s It will be obvious to one skilled in the art that the angle formed by the non-parallel sides of the wedge is substanof said shear block; and a wedge engaged between each non-parallel side of said shear block and the adjacent said inclined collar flange.

2. In a building structure, the combination according to claim 1 wherein the distance between the inwardmost edges of said flanges is substantially equal to the corresponding measurements of said column therein, and said collar is .slidable upon said column.

3. In a building structure, the combination according to claim 1 wherein said column has a recessed face portion therein and said shear block is located in said recessed face portion.

4; In a building structure, the combination according to claim 1 wherein said column has two generally oppositely disposed shear blocks thereon and a rigid spacing bar passing through said column and connecting said shear blocks. V

5. In a building structure, the combination according to claim 1 wherein each shear block i composed of two otr1 more segments making up a composite trapezoidal s ape.

6. In a building structure, the combination comprising a vertical column, a slab supporting collar encircling and slidable along said column, said column having an inclined surface which in a given vertical plane has a first angle of inclination to a vertical axis, said collar having an inclined surface facing said column inclined surface,

sad collar inclined surface having an inclination to a vertical axis in said given vertical plane which is less than sa1d first angle of inclination, a wedge which in said plane has its opposite non-parallel sides engaging said column inclined surface and said collarinclined surface respectively, said wedge havingits enlarged end elevated above its reduced end, said wedge being movable along an inclined axis in said given vertical plane to adjust the position of said collar on said column.

References Cited by the Examiner V UNITED STATES PATENTS HENRY c. SUTHERLAND, Primary Examiner. WILLIAM I. MUSHAKE, Examiner. 

1. IN A BUILDING STRUCTURE, THE COMBINATION COMPRISING A VERTICAL SUPPORT COLUMN HAVING AT LEAST ONE TRAPEZOIDAL SHEAR BLOCK MOUNTED THEREON IN A VERTICAL PLANE IN A MANNER WHEREBY THE LONGER PARALLEL SIDE OF SAID SHEAR BLOCK IS THE LOWERMOST HORIZONTAL EDGE; A SLAB; A COLLAR WITHIN SAID SLAB, SAID COLLAR COMPRISING A HORIZONTAL PLATE WITH AN APERTURE THEREIN, SAID APERTURE SURROUNDED BY AT LEAST TWO FLANGES WITH PORTIONS INCLINING INWARDLY AND UPWARDLY AND FACING THE NON-PARALLEL SIDES OF SAID SHEAR BLOCK, SAID INCLINED PORTIONS OF SAID FLANGES HAVING A LESSER INCLINATION TO A VERTICAL AXIS THAN DO THE NON-PARALLEL SIDES 